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Wang Z, Wang J, Guo J, Dove A, Arfanakis K, Qi X, Bennett DA, Xu W. Association of Motor Function With Cognitive Trajectories and Structural Brain Differences: A Community-Based Cohort Study. Neurology 2023; 101:e1718-e1728. [PMID: 37657942 PMCID: PMC10624482 DOI: 10.1212/wnl.0000000000207745] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2023] [Accepted: 06/20/2023] [Indexed: 09/03/2023] Open
Abstract
BACKGROUND AND OBJECTIVES The association of motor function with cognitive health remains controversial, and the mechanisms underlying this relationship are unclear. We aimed to examine the association between motor function and long-term cognitive trajectories and further explore the underlying mechanisms using brain MRI. METHODS In the Rush Memory and Aging Project, a prospective cohort study, a total of 2,192 volunteers were recruited from the communities in northeastern Illinois and followed up for up to 22 years (from 1997 to 2020). Individuals with dementia, disability, missing data on motor function at baseline, and missing follow-up data on cognitive function were excluded. At baseline, global motor function was evaluated using the averaged z scores of 10 motor tests covering dexterity, gait, and hand strength; the composite score was tertiled as low, moderate, or high. Global and domain-specific cognitive functions-including episodic memory, semantic memory, working memory, visuospatial ability, and perceptual speed-were measured annually through 19 cognitive tests. A subsample (n = 401) underwent brain MRI scans and regional brain volumes were measured. Data were analyzed using linear mixed-effects models and linear regression. RESULTS Among the 1,618 participants (mean age 79.45 ± 7.32 years) included in this study, baseline global motor function score ranged from 0.36 to 1.82 (mean 1.03 ± 0.22). Over the follow-up (median 6.03 years, interquartile range 3.00-10.01 years), low global motor function and its subcomponents were related to significantly faster declines in global cognitive function (β = -0.005, 95% CI -0.006 to -0.005) and each of the 5 cognitive domains. Of the 344 participants with available MRI data, low motor function was also associated with smaller total brain (β = -25.848, 95% CI -44.902 to -6.795), total white matter (β = -18.252, 95% CI -33.277 to -3.226), and cortical white matter (β = -17.503, 95% CI -32.215 to -2.792) volumes, but a larger volume of white matter hyperintensities (β = 0.257, 95% CI 0.118-0.397). DISCUSSION Low motor function is associated with an accelerated decline in global and domain-specific cognitive functions. Both neurodegenerative and cerebrovascular pathologies might contribute to this association.
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Affiliation(s)
- Zhangyu Wang
- From the Department of Epidemiology and Biostatistics (Z.W., J.W., X.Q., W.X.), School of Public Health, Tianjin Medical University, China; Aging Research Center, Department of Neurobiology (J.G., A.D., W.X.), Care Sciences and Society, Karolinska Institutet, Stockholm, Sweden; Rush Alzheimer's Disease Center (K.A., D.A.B.), Rush University Medical Center, Chicago, IL; and Department of Biomedical Engineering (K.A.), Illinois Institute of Technology, Chicago
| | - Jiao Wang
- From the Department of Epidemiology and Biostatistics (Z.W., J.W., X.Q., W.X.), School of Public Health, Tianjin Medical University, China; Aging Research Center, Department of Neurobiology (J.G., A.D., W.X.), Care Sciences and Society, Karolinska Institutet, Stockholm, Sweden; Rush Alzheimer's Disease Center (K.A., D.A.B.), Rush University Medical Center, Chicago, IL; and Department of Biomedical Engineering (K.A.), Illinois Institute of Technology, Chicago
| | - Jie Guo
- From the Department of Epidemiology and Biostatistics (Z.W., J.W., X.Q., W.X.), School of Public Health, Tianjin Medical University, China; Aging Research Center, Department of Neurobiology (J.G., A.D., W.X.), Care Sciences and Society, Karolinska Institutet, Stockholm, Sweden; Rush Alzheimer's Disease Center (K.A., D.A.B.), Rush University Medical Center, Chicago, IL; and Department of Biomedical Engineering (K.A.), Illinois Institute of Technology, Chicago
| | - Abigail Dove
- From the Department of Epidemiology and Biostatistics (Z.W., J.W., X.Q., W.X.), School of Public Health, Tianjin Medical University, China; Aging Research Center, Department of Neurobiology (J.G., A.D., W.X.), Care Sciences and Society, Karolinska Institutet, Stockholm, Sweden; Rush Alzheimer's Disease Center (K.A., D.A.B.), Rush University Medical Center, Chicago, IL; and Department of Biomedical Engineering (K.A.), Illinois Institute of Technology, Chicago
| | - Konstantinos Arfanakis
- From the Department of Epidemiology and Biostatistics (Z.W., J.W., X.Q., W.X.), School of Public Health, Tianjin Medical University, China; Aging Research Center, Department of Neurobiology (J.G., A.D., W.X.), Care Sciences and Society, Karolinska Institutet, Stockholm, Sweden; Rush Alzheimer's Disease Center (K.A., D.A.B.), Rush University Medical Center, Chicago, IL; and Department of Biomedical Engineering (K.A.), Illinois Institute of Technology, Chicago
| | - Xiuying Qi
- From the Department of Epidemiology and Biostatistics (Z.W., J.W., X.Q., W.X.), School of Public Health, Tianjin Medical University, China; Aging Research Center, Department of Neurobiology (J.G., A.D., W.X.), Care Sciences and Society, Karolinska Institutet, Stockholm, Sweden; Rush Alzheimer's Disease Center (K.A., D.A.B.), Rush University Medical Center, Chicago, IL; and Department of Biomedical Engineering (K.A.), Illinois Institute of Technology, Chicago
| | - David A Bennett
- From the Department of Epidemiology and Biostatistics (Z.W., J.W., X.Q., W.X.), School of Public Health, Tianjin Medical University, China; Aging Research Center, Department of Neurobiology (J.G., A.D., W.X.), Care Sciences and Society, Karolinska Institutet, Stockholm, Sweden; Rush Alzheimer's Disease Center (K.A., D.A.B.), Rush University Medical Center, Chicago, IL; and Department of Biomedical Engineering (K.A.), Illinois Institute of Technology, Chicago
| | - Weili Xu
- From the Department of Epidemiology and Biostatistics (Z.W., J.W., X.Q., W.X.), School of Public Health, Tianjin Medical University, China; Aging Research Center, Department of Neurobiology (J.G., A.D., W.X.), Care Sciences and Society, Karolinska Institutet, Stockholm, Sweden; Rush Alzheimer's Disease Center (K.A., D.A.B.), Rush University Medical Center, Chicago, IL; and Department of Biomedical Engineering (K.A.), Illinois Institute of Technology, Chicago.
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Bhattarai K, Rajaganapathy S, Das T, Kim Y, Chen Y, Dai Q, Li X, Jiang X, Zong N. Using artificial intelligence to learn optimal regimen plan for Alzheimer's disease. J Am Med Inform Assoc 2023; 30:1645-1656. [PMID: 37463858 PMCID: PMC10531148 DOI: 10.1093/jamia/ocad135] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2023] [Revised: 06/21/2023] [Accepted: 07/12/2023] [Indexed: 07/20/2023] Open
Abstract
BACKGROUND Alzheimer's disease (AD) is a progressive neurological disorder with no specific curative medications. Sophisticated clinical skills are crucial to optimize treatment regimens given the multiple coexisting comorbidities in the patient population. OBJECTIVE Here, we propose a study to leverage reinforcement learning (RL) to learn the clinicians' decisions for AD patients based on the longitude data from electronic health records. METHODS In this study, we selected 1736 patients from the Alzheimer's Disease Neuroimaging Initiative (ADNI) database. We focused on the two most frequent concomitant diseases-depression, and hypertension, thus creating 5 data cohorts (ie, Whole Data, AD, AD-Hypertension, AD-Depression, and AD-Depression-Hypertension). We modeled the treatment learning into an RL problem by defining states, actions, and rewards. We built a regression model and decision tree to generate multiple states, used six combinations of medications (ie, cholinesterase inhibitors, memantine, memantine-cholinesterase inhibitors, hypertension drugs, supplements, or no drugs) as actions, and Mini-Mental State Exam (MMSE) scores as rewards. RESULTS Given the proper dataset, the RL model can generate an optimal policy (regimen plan) that outperforms the clinician's treatment regimen. Optimal policies (ie, policy iteration and Q-learning) had lower rewards than the clinician's policy (mean -3.03 and -2.93 vs. -2.93, respectively) for smaller datasets but had higher rewards for larger datasets (mean -4.68 and -2.82 vs. -4.57, respectively). CONCLUSIONS Our results highlight the potential of using RL to generate the optimal treatment based on the patients' longitude records. Our work can lead the path towards developing RL-based decision support systems that could help manage AD with comorbidities.
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Affiliation(s)
| | | | - Trisha Das
- University of Illinois Urbana-Champaign, Champaign, Illinois, USA
| | - Yejin Kim
- University of Texas Health Science Center, Houston, Texas, USA
| | | | | | | | | | | | - Xiaoqian Jiang
- University of Texas Health Science Center, Houston, Texas, USA
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Bhattarai K, Das T, Kim Y, Chen Y, Dai Q, Li X, Jiang X, Zong N. Using Artificial Intelligence to Learn Optimal Regimen Plan for Alzheimer's Disease. MEDRXIV : THE PREPRINT SERVER FOR HEALTH SCIENCES 2023:2023.01.26.23285064. [PMID: 36747733 PMCID: PMC9901063 DOI: 10.1101/2023.01.26.23285064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Background Alzheimer's Disease (AD) is a progressive neurological disorder with no specific curative medications. While only a few medications are approved by FDA (i.e., donepezil, galantamine, rivastigmine, and memantine) to relieve symptoms (e.g., cognitive decline), sophisticated clinical skills are crucial to optimize the appropriate regimens given the multiple coexisting comorbidities in this patient population. Objective Here, we propose a study to leverage reinforcement learning (RL) to learn the clinicians' decisions for AD patients based on the longitude records from Electronic Health Records (EHR). Methods In this study, we withdraw 1,736 patients fulfilling our criteria, from the Alzheimer's Disease Neuroimaging Initiative(ADNI) database. We focused on the two most frequent concomitant diseases, depression, and hypertension, thus resulting in five main cohorts, 1) whole data, 2) AD-only, 3) AD-hypertension, 4) AD-depression, and 5) AD-hypertension-depression. We modeled the treatment learning into an RL problem by defining the three factors (i.e., states, action, and reward) in RL in multiple strategies, where a regression model and a decision tree are developed to generate states, six main medications extracted (i.e., no drugs, cholinesterase inhibitors, memantine, hypertension drugs, a combination of cholinesterase inhibitors and memantine, and supplements or other drugs) are for action, and Mini-Mental State Exam (MMSE) scores are for reward. Results Given the proper dataset, the RL model can generate an optimal policy (regimen plan) that outperforms the clinician's treatment regimen. With the smallest data samples, the optimal-policy (i.e., policy iteration and Q-learning) gained a lesser reward than the clinician's policy (mean -2.68 and -2.76 vs . -2.66, respectively), but it gained more reward once the data size increased (mean -3.56 and -2.48 vs . -3.57, respectively). Conclusions Our results highlight the potential of using RL to generate the optimal treatment based on the patients' longitude records. Our work can lead the path toward the development of RL-based decision support systems which could facilitate the daily practice to manage Alzheimer's disease with comorbidities.
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Affiliation(s)
- Kritib Bhattarai
- Department of Computer Science, Luther College Decorah, IA, United States
| | - Trisha Das
- Department of Computer Science, University of Illinois Urbana-Champaign Champaign, Champaign, IL, United States
| | - Yejin Kim
- School of Biomedical Informatics, University of Texas Health Science Center, Houston, TX, United States
| | | | - Qiying Dai
- Mayo Clinic Rochester, MN, United States
| | | | - Xiaoqian Jiang
- School of Biomedical Informatics, University of Texas Health Science Center, Houston, TX, United States
| | - Nansu Zong
- School of Biomedical Informatics, University of Texas Health Science Center, Houston, TX, United States
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Wang J, Song R, Dove A, Qi X, Ma J, Laukka EJ, Bennett DA, Xu W. Pulmonary function is associated with cognitive decline and structural brain differences. Alzheimers Dement 2022; 18:1335-1344. [PMID: 34590419 PMCID: PMC10085529 DOI: 10.1002/alz.12479] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2021] [Revised: 08/12/2021] [Accepted: 08/16/2021] [Indexed: 01/16/2023]
Abstract
The association of poor pulmonary function (PF) with cognitive trajectories and structural brain differences remains unclear. Within the Rush Memory and Aging Project, 1377 dementia-free subjects were followed up to 21 years. PF was assessed with a composite score measured at baseline. Global and domain-specific cognitive function was assessed annually constructed from 19 cognitive tests. A subsample of 351 participants underwent brain magnetic resonance imaging to investigate the cross-sectional association between PF and structural brain volumes. We found that low PF was related to faster decline in global cognition, and domain-specific function including episodic memory, semantic memory, working memory, visuospatial ability, and perceptual speed. In addition, low PF was associated with smaller volumes of total brain, white matter and gray matter, and larger white matter hyperintensities volume. Our results suggest that low PF is associated with faster cognitive decline, and both neurodegeneration and vascular brain lesions may underlie the association.
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Affiliation(s)
- Jiao Wang
- Department of Epidemiology and Biostatistics, School of Public Health, Tianjin Medical University, Tianjin, China
- Tianjin Key Laboratory of Environment, Nutrition and Public Health
- Center for International Collaborative Research on Environment, Nutrition and Public Health
| | - Ruixue Song
- Department of Epidemiology and Biostatistics, School of Public Health, Tianjin Medical University, Tianjin, China
- Tianjin Key Laboratory of Environment, Nutrition and Public Health
- Center for International Collaborative Research on Environment, Nutrition and Public Health
| | - Abigail Dove
- Department of Neurobiology, Care Sciences and Society, Karolinska Institutet, Stockholm, Sweden
| | - Xiuying Qi
- Department of Epidemiology and Biostatistics, School of Public Health, Tianjin Medical University, Tianjin, China
- Tianjin Key Laboratory of Environment, Nutrition and Public Health
- Center for International Collaborative Research on Environment, Nutrition and Public Health
| | - Jun Ma
- Department of Epidemiology and Biostatistics, School of Public Health, Tianjin Medical University, Tianjin, China
| | - Erika J Laukka
- Department of Neurobiology, Care Sciences and Society, Karolinska Institutet, Stockholm, Sweden
- Stockholm Gerontology Research Center, Stockholm, Sweden
| | - David A. Bennett
- Rush Alzheimer’s Disease Center, Rush University Medical Center, Chicago, Illinois, 60612
| | - Weili Xu
- Department of Neurobiology, Care Sciences and Society, Karolinska Institutet, Stockholm, Sweden
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5
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Zavaliangos‐Petropulu A, Tubi MA, Haddad E, Zhu A, Braskie MN, Jahanshad N, Thompson PM, Liew S. Testing a convolutional neural network-based hippocampal segmentation method in a stroke population. Hum Brain Mapp 2022; 43:234-243. [PMID: 33067842 PMCID: PMC8675423 DOI: 10.1002/hbm.25210] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2020] [Revised: 09/03/2020] [Accepted: 09/05/2020] [Indexed: 12/22/2022] Open
Abstract
As stroke mortality rates decrease, there has been a surge of effort to study poststroke dementia (PSD) to improve long-term quality of life for stroke survivors. Hippocampal volume may be an important neuroimaging biomarker in poststroke dementia, as it has been associated with many other forms of dementia. However, studying hippocampal volume using MRI requires hippocampal segmentation. Advances in automated segmentation methods have allowed for studying the hippocampus on a large scale, which is important for robust results in the heterogeneous stroke population. However, most of these automated methods use a single atlas-based approach and may fail in the presence of severe structural abnormalities common in stroke. Hippodeep, a new convolutional neural network-based hippocampal segmentation method, does not rely solely on a single atlas-based approach and thus may be better suited for stroke populations. Here, we compared quality control and the accuracy of segmentations generated by Hippodeep and two well-accepted hippocampal segmentation methods on stroke MRIs (FreeSurfer 6.0 whole hippocampus and FreeSurfer 6.0 sum of hippocampal subfields). Quality control was performed using a stringent protocol for visual inspection of the segmentations, and accuracy was measured as volumetric correlation with manual segmentations. Hippodeep performed significantly better than both FreeSurfer methods in terms of quality control. All three automated segmentation methods had good correlation with manual segmentations and no one method was significantly more correlated than the others. Overall, this study suggests that both Hippodeep and FreeSurfer may be useful for hippocampal segmentation in stroke rehabilitation research, but Hippodeep may be more robust to stroke lesion anatomy.
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Affiliation(s)
- Artemis Zavaliangos‐Petropulu
- Neural Plasticity and Neurorehabilitation LaboratoryUniversity of Southern CaliforniaLos AngelesCaliforniaUSA
- Imaging Genetics Center, Mark & Mary Stevens Institute for Neuroimaging & InformaticsKeck School of Medicine of USCMarina del ReyCaliforniaUSA
| | - Meral A. Tubi
- Imaging Genetics Center, Mark & Mary Stevens Institute for Neuroimaging & InformaticsKeck School of Medicine of USCMarina del ReyCaliforniaUSA
| | - Elizabeth Haddad
- Imaging Genetics Center, Mark & Mary Stevens Institute for Neuroimaging & InformaticsKeck School of Medicine of USCMarina del ReyCaliforniaUSA
| | - Alyssa Zhu
- Imaging Genetics Center, Mark & Mary Stevens Institute for Neuroimaging & InformaticsKeck School of Medicine of USCMarina del ReyCaliforniaUSA
| | - Meredith N. Braskie
- Imaging Genetics Center, Mark & Mary Stevens Institute for Neuroimaging & InformaticsKeck School of Medicine of USCMarina del ReyCaliforniaUSA
| | - Neda Jahanshad
- Imaging Genetics Center, Mark & Mary Stevens Institute for Neuroimaging & InformaticsKeck School of Medicine of USCMarina del ReyCaliforniaUSA
| | - Paul M. Thompson
- Imaging Genetics Center, Mark & Mary Stevens Institute for Neuroimaging & InformaticsKeck School of Medicine of USCMarina del ReyCaliforniaUSA
| | - Sook‐Lei Liew
- Neural Plasticity and Neurorehabilitation LaboratoryUniversity of Southern CaliforniaLos AngelesCaliforniaUSA
- Imaging Genetics Center, Mark & Mary Stevens Institute for Neuroimaging & InformaticsKeck School of Medicine of USCMarina del ReyCaliforniaUSA
- Chan Division of Occupational Science and Occupational TherapyOstrow School of Dentistry, University of Southern CaliforniaLos AngelesCaliforniaUSA
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6
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Greve DN, Billot B, Cordero D, Hoopes A, Hoffmann M, Dalca AV, Fischl B, Iglesias JE, Augustinack JC. A deep learning toolbox for automatic segmentation of subcortical limbic structures from MRI images. Neuroimage 2021; 244:118610. [PMID: 34571161 PMCID: PMC8643077 DOI: 10.1016/j.neuroimage.2021.118610] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2021] [Revised: 09/16/2021] [Accepted: 09/20/2021] [Indexed: 11/20/2022] Open
Abstract
A tool was developed to automatically segment several subcortical limbic structures (nucleus accumbens, basal forebrain, septal nuclei, hypothalamus without mammillary bodies, the mammillary bodies, and fornix) using only a T1-weighted MRI as input. This tool fills an unmet need as there are few, if any, publicly available tools to segment these clinically relevant structures. A U-Net with spatial, intensity, contrast, and noise augmentation was trained using 39 manually labeled MRI data sets. In general, the Dice scores, true positive rates, false discovery rates, and manual-automatic volume correlation were very good relative to comparable tools for other structures. A diverse data set of 698 subjects were segmented using the tool; evaluation of the resulting labelings showed that the tool failed in less than 1% of cases. Test-retest reliability of the tool was excellent. The automatically segmented volume of all structures except mammillary bodies showed effectiveness at detecting either clinical AD effects, age effects, or both. This tool will be publicly released with FreeSurfer (surfer.nmr.mgh.harvard.edu/fswiki/ScLimbic). Together with the other cortical and subcortical limbic segmentations, this tool will allow FreeSurfer to provide a comprehensive view of the limbic system in an automated way.
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Affiliation(s)
- Douglas N Greve
- Athinoula A. Martinos Center for Biomedical Imaging, Department of Radiology, Massachusetts General Hospital, Boston, MA, USA; Harvard Medical School, Radiology Department, Boston, MA, USA.
| | - Benjamin Billot
- Centre for Medical Image Computing, Department of Medical Physics and Biomedical Engineering, University College London, UK
| | - Devani Cordero
- Athinoula A. Martinos Center for Biomedical Imaging, Department of Radiology, Massachusetts General Hospital, Boston, MA, USA
| | - Andrew Hoopes
- Athinoula A. Martinos Center for Biomedical Imaging, Department of Radiology, Massachusetts General Hospital, Boston, MA, USA
| | - Malte Hoffmann
- Athinoula A. Martinos Center for Biomedical Imaging, Department of Radiology, Massachusetts General Hospital, Boston, MA, USA; Harvard Medical School, Radiology Department, Boston, MA, USA
| | - Adrian V Dalca
- Athinoula A. Martinos Center for Biomedical Imaging, Department of Radiology, Massachusetts General Hospital, Boston, MA, USA; Harvard Medical School, Radiology Department, Boston, MA, USA; Computer Science and Artificial Intelligence Laboratory, Massachusetts Institute of Technology, Boston, USA
| | - Bruce Fischl
- Athinoula A. Martinos Center for Biomedical Imaging, Department of Radiology, Massachusetts General Hospital, Boston, MA, USA; Harvard Medical School, Radiology Department, Boston, MA, USA; Computer Science and Artificial Intelligence Laboratory, Massachusetts Institute of Technology, Boston, USA
| | - Juan Eugenio Iglesias
- Athinoula A. Martinos Center for Biomedical Imaging, Department of Radiology, Massachusetts General Hospital, Boston, MA, USA; Harvard Medical School, Radiology Department, Boston, MA, USA; Centre for Medical Image Computing, Department of Medical Physics and Biomedical Engineering, University College London, UK; Computer Science and Artificial Intelligence Laboratory, Massachusetts Institute of Technology, Boston, USA
| | - Jean C Augustinack
- Athinoula A. Martinos Center for Biomedical Imaging, Department of Radiology, Massachusetts General Hospital, Boston, MA, USA; Harvard Medical School, Radiology Department, Boston, MA, USA
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Fjell AM, Sørensen Ø, Amlien IK, Bartrés-Faz D, Bros DM, Buchmann N, Demuth I, Drevon CA, Düzel S, Ebmeier KP, Idland AV, Kietzmann TC, Kievit R, Kühn S, Lindenberger U, Mowinckel AM, Nyberg L, Price D, Sexton CE, Solé-Padullés C, Pudas S, Sederevicius D, Suri S, Wagner G, Watne LO, Westerhausen R, Zsoldos E, Walhovd KB. Self-reported sleep relates to hippocampal atrophy across the adult lifespan: results from the Lifebrain consortium. Sleep 2021; 43:5628807. [PMID: 31738420 PMCID: PMC7215271 DOI: 10.1093/sleep/zsz280] [Citation(s) in RCA: 41] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2019] [Revised: 10/25/2019] [Indexed: 12/17/2022] Open
Abstract
Objectives Poor sleep is associated with multiple age-related neurodegenerative and neuropsychiatric conditions. The hippocampus plays a special role in sleep and sleep-dependent cognition, and accelerated hippocampal atrophy is typically seen with higher age. Hence, it is critical to establish how the relationship between sleep and hippocampal volume loss unfolds across the adult lifespan. Methods Self-reported sleep measures and MRI-derived hippocampal volumes were obtained from 3105 cognitively normal participants (18–90 years) from major European brain studies in the Lifebrain consortium. Hippocampal volume change was estimated from 5116 MRIs from 1299 participants for whom longitudinal MRIs were available, followed up to 11 years with a mean interval of 3.3 years. Cross-sectional analyses were repeated in a sample of 21,390 participants from the UK Biobank. Results No cross-sectional sleep—hippocampal volume relationships were found. However, worse sleep quality, efficiency, problems, and daytime tiredness were related to greater hippocampal volume loss over time, with high scorers showing 0.22% greater annual loss than low scorers. The relationship between sleep and hippocampal atrophy did not vary across age. Simulations showed that the observed longitudinal effects were too small to be detected as age-interactions in the cross-sectional analyses. Conclusions Worse self-reported sleep is associated with higher rates of hippocampal volume decline across the adult lifespan. This suggests that sleep is relevant to understand individual differences in hippocampal atrophy, but limited effect sizes call for cautious interpretation.
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Affiliation(s)
- Anders M Fjell
- Center for Lifespan Changes in Brain and Cognition, University of Oslo, Norway.,Department of Radiology and Nuclear Medicine, Oslo University Hospital, Norway
| | - Øystein Sørensen
- Center for Lifespan Changes in Brain and Cognition, University of Oslo, Norway
| | - Inge K Amlien
- Center for Lifespan Changes in Brain and Cognition, University of Oslo, Norway
| | - David Bartrés-Faz
- Departament de Medicina, Facultat de Medicina i Ciències de la Salut, Universitat de Barcelona, and Institut de Neurociències, Universitat de Barcelona, Spain
| | - Didac Maciá Bros
- Departament de Medicina, Facultat de Medicina i Ciències de la Salut, Universitat de Barcelona, and Institut de Neurociències, Universitat de Barcelona, Spain
| | - Nikolaus Buchmann
- Department of Cardiology, Charité - University Medicine Berlin Campus Benjamin Franklin, Berlin, Germany
| | - Ilja Demuth
- Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Lipid Clinic at the Interdisciplinary Metabolism Center, Germany
| | - Christian A Drevon
- Vitas AS, Research Park, Gaustadalleen 21, 0349, Oslo and 6 University of Oslo, Department of Nutrition, Institute of Basic Medical Sciences, Faculty of Medicine, Medicine/University of Oslo, Norway
| | - Sandra Düzel
- Max Planck Institute for Human Development, Germany
| | | | - Ane-Victoria Idland
- Center for Lifespan Changes in Brain and Cognition, University of Oslo, Norway.,Oslo Delirium Research Group, Department of Geriatric Medicine, University of Oslo, Norway.,Institute of Basic Medical Sciences, University of Oslo, Norway
| | - Tim C Kietzmann
- MRC Cognition and Brain Sciences Unit, University of Cambridge, UK
| | - Rogier Kievit
- MRC Cognition and Brain Sciences Unit, University of Cambridge, UK
| | - Simone Kühn
- Max Planck Institute for Human Development, Germany.,Department of Psychiatry and Psychotherapy, University Medical Center Hamburg-Eppendorf, Germany
| | | | | | - Lars Nyberg
- Umeå Center for Functional Brain Imaging, Umeå University, Umeå, Sweden
| | - Darren Price
- MRC Cognition and Brain Sciences Unit, University of Cambridge, UK
| | - Claire E Sexton
- Department of Psychiatry, University of Oxford, UK.,Global Brain Health Institute, Department of Neurology, University of California San Francisco, CA.,Wellcome Centre for Integrative Neuroimaging, University of Oxford, UK
| | - Cristina Solé-Padullés
- Departament de Medicina, Facultat de Medicina i Ciències de la Salut, Universitat de Barcelona, and Institut de Neurociències, Universitat de Barcelona, Spain
| | - Sara Pudas
- Umeå Center for Functional Brain Imaging, Umeå University, Umeå, Sweden
| | | | - Sana Suri
- Department of Psychiatry, University of Oxford, UK.,Wellcome Centre for Integrative Neuroimaging, University of Oxford, UK
| | - Gerd Wagner
- Psychiatric Brain and Body Research Group, Department of Psychiatry and Psychotherapy, Jena University Hospital, Jena, Germany
| | - Leiv Otto Watne
- Oslo Delirium Research Group, Department of Geriatric Medicine, University of Oslo, Norway
| | - René Westerhausen
- Center for Lifespan Changes in Brain and Cognition, University of Oslo, Norway
| | - Enikő Zsoldos
- Department of Psychiatry, University of Oxford, UK.,Wellcome Centre for Integrative Neuroimaging, University of Oxford, UK
| | - Kristine B Walhovd
- Center for Lifespan Changes in Brain and Cognition, University of Oslo, Norway.,Department of Radiology and Nuclear Medicine, Oslo University Hospital, Norway
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8
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Cyprien F, Berr C, Maller JJ, Meslin C, Gentreau M, Mura T, Gabelle A, Courtet P, Ritchie K, Ancelin ML, Artero S. Late-life cynical hostility is associated with white matter alterations and the risk of Alzheimer's disease. Psychol Med 2021; 52:1-10. [PMID: 33849668 DOI: 10.1017/s0033291721000416] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
BACKGROUND Cynical hostility (CH), a specific dimension of hostility that consists of a mistrust of others, has been suggested as a high-risk trait for dementia. However, the influence of CH on the incidence of Alzheimer's disease (AD) remains poorly understood. This study investigated whether late-life CH is associated with AD risk and structural neuroimaging markers of AD. METHODS In community-dwelling older adults from the French ESPRIT cohort (n = 1388), incident dementia rate according to CH level was monitored during an 8-year follow-up and analyzed using Cox proportional hazards regression models. Brain magnetic resonance imaging volumes were measured at baseline (n = 508). Using automated segmentation procedures (Freesurfer 6.0), the authors assessed brain grey and white volumes on all magnetic resonance imaging scans. They also measured white matter hyperintensities volumes using semi-automated procedures. Mean volumes according to the level of CH were compared using ANOVA. RESULTS Eighty-four participants developed dementia (32 with AD). After controlling for potential confounders, high CH was predictive of AD (HR 2.74; 95% CI 1.10-6.85; p = 0.030) and all dementia types are taken together (HR 2.30; 95% CI 1.10-4.80; p = 0.027). High CH was associated with white matter alterations, particularly smaller anterior corpus callosum volume (p < 0.01) after False Discovery Rate correction, but not with grey matter volumes. CONCLUSIONS High CH in late life is associated with cerebral white matter alterations, designated as early markers of dementia, and higher AD risk. Identifying lifestyle and biological determinants related to CH could provide clues on AD physiopathology and avenues for prevention strategies.
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Affiliation(s)
- Fabienne Cyprien
- IGF, Univ Montpellier, CNRS, INSERM, Montpellier, France
- CHU Montpellier, Montpellier, France
| | | | - Jerome J Maller
- Monash Alfred Psychiatry Research Centre, The Alfred & Monash University School of Psychology and Psychiatry, Melbourne, Australia
| | - Chantal Meslin
- Centre for Mental Health Research, Australian National University, Canberra, Australia
| | | | - Thibault Mura
- INM, Univ Montpellier, INSERM, Montpellier, France
- CHU Nîmes, Nîmes, France
| | - Audrey Gabelle
- CHU Montpellier, Montpellier, France
- INM, Univ Montpellier, INSERM, Montpellier, France
| | - Philippe Courtet
- IGF, Univ Montpellier, CNRS, INSERM, Montpellier, France
- CHU Montpellier, Montpellier, France
| | - Karen Ritchie
- INM, Univ Montpellier, INSERM, Montpellier, France
- Centre for Clinical Brain Sciences, University of Edinburgh, Edinburgh, UK
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9
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Cai LY, Kerley CI, Yu C, Aboud KS, Beason-Held LL, Shafer AT, Resnick SM, Jordan LC, Anderson AW, Schilling KG, Lyu I, Landman BA. Joint cortical surface and structural connectivity analysis of Alzheimer's Disease. PROCEEDINGS OF SPIE--THE INTERNATIONAL SOCIETY FOR OPTICAL ENGINEERING 2021; 11596:1159630. [PMID: 34354323 PMCID: PMC8336655 DOI: 10.1117/12.2580956] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Prior neuroimaging studies have demonstrated isolated structural and connectivity changes in the brain due to Alzheimer's Disease (AD). However, how these changes relate to each other is not well understood. We present a preliminary study to begin to fill this gap by leveraging joint independent component analysis (jICA). We explore how jICA performs in an analysis of T1 and diffusion weighted MRI by characterizing the joint changes of complex cortical surface and structural connectivity metrics in AD in subjects from the Baltimore Longitudinal Study of Aging. We calculate 588 region-based cortical metrics and 4,753 fractional anisotropy-based connectivity metrics and project them into a low-dimensional manifold with principal component analysis. We perform jICA on the manifold and subsequently backproject the independent components to the original data space. We demonstrate component stability with 3-fold cross validation and find differential component loadings between 776 cognitively unimpaired control subjects and 23 with AD that generalizes across folds. In addition, we perform the same analysis on the surface and connectivity metrics separately and find that the joint approach identifies both novel and similar components to the separate approaches. To illustrate the joint approach's primary utility, we provide an example hypothesis for how surface and connectivity components may vary together with AD. These preliminary results suggest jointly varying independent cortical surface and structural connectivity components can be consistently extracted from MRI data and provide a data-driven way for generating novel hypotheses about AD that may not be captured by separate analyses.
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Affiliation(s)
- Leon Y Cai
- Department of Biomedical Engineering, Vanderbilt University, Nashville, TN, USA
| | - Cailey I Kerley
- Department of Electrical Engineering and Computer Science, Vanderbilt University, Nashville, TN, USA
| | - Chang Yu
- Department of Electrical Engineering and Computer Science, Vanderbilt University, Nashville, TN, USA
| | - Katherine S Aboud
- Vanderbilt Brain Institute, Vanderbilt University, Nashville, TN, USA
| | - Lori L Beason-Held
- Laboratory of Behavioral Neuroscience, National Institute on Aging, National Institutes of Health, Baltimore, MD, USA
| | - Andrea T Shafer
- Laboratory of Behavioral Neuroscience, National Institute on Aging, National Institutes of Health, Baltimore, MD, USA
| | - Susan M Resnick
- Laboratory of Behavioral Neuroscience, National Institute on Aging, National Institutes of Health, Baltimore, MD, USA
| | - Lori C Jordan
- Department of Pediatrics, Division of Pediatric Neurology, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Adam W Anderson
- Department of Biomedical Engineering, Vanderbilt University, Nashville, TN, USA
- Department of Radiology and Radiological Sciences, Vanderbilt University Medical Center, Nashville, TN, USA
- Vanderbilt University Institute of Imaging Science, Vanderbilt University, Nashville, TN, USA
| | - Kurt G Schilling
- Department of Radiology and Radiological Sciences, Vanderbilt University Medical Center, Nashville, TN, USA
- Vanderbilt University Institute of Imaging Science, Vanderbilt University, Nashville, TN, USA
| | - Ilwoo Lyu
- Department of Electrical Engineering and Computer Science, Vanderbilt University, Nashville, TN, USA
| | - Bennett A Landman
- Department of Biomedical Engineering, Vanderbilt University, Nashville, TN, USA
- Department of Electrical Engineering and Computer Science, Vanderbilt University, Nashville, TN, USA
- Department of Radiology and Radiological Sciences, Vanderbilt University Medical Center, Nashville, TN, USA
- Vanderbilt University Institute of Imaging Science, Vanderbilt University, Nashville, TN, USA
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10
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Valdés Hernández MDC, Reid S, Mikhael S, Pernet C. Do 2-year changes in superior frontal gyrus and global brain atrophy affect cognition? ALZHEIMER'S & DEMENTIA: DIAGNOSIS, ASSESSMENT & DISEASE MONITORING 2018; 10:706-716. [PMID: 30511008 PMCID: PMC6258225 DOI: 10.1016/j.dadm.2018.07.010] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Introduction Metabolic alterations to the superior frontal gyrus (SFG) have been linked to cognitive decline. Whether these indicate structural atrophy, which could be screened for at a larger scale using noninvasive structural imaging, is unknown. Methods We assessed annual structural magnetic resonance imaging scans and cognitive data from 3 consecutive years from 204 participants from the AD Neuroimaging Initiative database (mean age 72.24 [8.175] years). We evaluated associations between brain structural changes and performance in the Montreal Cognitive Assessment, Everyday Cognition Visuospatial subtest (ECog Visuospatial), and Functional Assessment Questionnaire. Results Changes in the surface area of the SFG were associated with changes in the outcome of the ECog Visuospatial test (P < .05), but an inconsistent pattern of association was found between the 2-year global brain atrophy progression and changes in the outcome from the three cognitive tests selected. Discussion The extent into which (and if) changes in the SFG influence cognition warrant further evaluation in a larger period in more heterogeneous population.
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Affiliation(s)
- Maria Del C Valdés Hernández
- Department of Neuroimaging Sciences, Centre for Clinical Brain Sciences, University of Edinburgh, Edinburgh, UK.,Row Fogo Centre into Ageing and the Brain at the Edinburgh Dementia Research Centre in the UK, Dementia Research Initiative, Edinburgh, UK.,Edinburgh Imaging (www.ed.ac.uk/edinburgh-imaging), University of Edinburgh, Edinburgh, UK
| | - Stuart Reid
- College of Medicine and Veterinary Medicine, University of Edinburgh, Edinburgh, UK
| | - Shadia Mikhael
- Department of Neuroimaging Sciences, Centre for Clinical Brain Sciences, University of Edinburgh, Edinburgh, UK
| | - Cyril Pernet
- Department of Neuroimaging Sciences, Centre for Clinical Brain Sciences, University of Edinburgh, Edinburgh, UK.,Edinburgh Imaging (www.ed.ac.uk/edinburgh-imaging), University of Edinburgh, Edinburgh, UK
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11
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Tuokkola T, Koikkalainen J, Parkkola R, Karrasch M, Lötjönen J, Rinne JO. Longitudinal changes in the brain in mild cognitive impairment: a magnetic resonance imaging study using the visual rating method and tensor-based morphometry. Acta Radiol 2018; 59:973-979. [PMID: 28952780 DOI: 10.1177/0284185117734418] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Background Brain atrophy is associated with mild cognitive impairment (MCI), and by using volumetric and visual analyzing methods, it is possible to differentiate between individuals with progressive MCI (MCIp) and stable MCI (MCIs). Automated analysis methods detect degenerative changes in the brain earlier and more reliably than visual methods. Purpose To detect and evaluate structural brain changes between and within the MCIs, MCIp, and control groups during a two-year follow-up period. Material and Methods Brain magnetic resonance imaging (MRI) scans of 11 participants with MCIs, 18 participants with MCIp, and 84 controls were analyzed by the visual rating method (VRM) and tensor-based morphometry (TBM). Results At baseline, both VRM and TBM differentiated the whole MCI group (combined MCIs and MCIp) and the MCIp group from the control group, but they did not differentiate the MCIs group from the control group. At follow-up, both methods differentiated the MCIp group from the control group, but minor differences between the MCIs and control groups were only seen by TBM. Neuropsychological tests did not find differences between the MCIs and control groups at follow-up. Neither method revealed relevant signs of brain atrophy progression within or between MCI subgroups during the follow-up time. Conclusion Both methods are equally good in the evaluation of structural brain changes in MCI if the groups are sufficiently large and the disease progresses to AD. Only TBM disclosed minor atrophic changes in the MCIs group compared to controls at follow-up. The results need to be confirmed with a large patient group and longer follow-up time.
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Affiliation(s)
- Terhi Tuokkola
- Turku PET Centre, Turku University Hospital, Turku, Finland
| | - Juha Koikkalainen
- University of Eastern Finland, Faculty of Health Sciences, Kuopio, Finland
| | - Riitta Parkkola
- Department of Radiology, University Hospital of Turku and Turku University Hospital, Turku, Finland
| | - Mira Karrasch
- Department of Psychology, Abo Akademi University, Turku, Finland
| | - Jyrki Lötjönen
- Aalto University, Department of Neuroscience and Biomedical Engineering, Helsinki, Finland VTT Technical Research Centre of Finland, Tampere, Finland
| | - Juha O Rinne
- Turku PET Centre, Turku University Hospital, Turku, Finland
- Finland Division of Clinical Neurosciences, Turku University Hospital, Turku, Finland
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12
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Knickmeyer RC, Xia K, Lu Z, Ahn M, Jha SC, Zou F, Zhu H, Styner M, Gilmore JH. Impact of Demographic and Obstetric Factors on Infant Brain Volumes: A Population Neuroscience Study. Cereb Cortex 2018; 27:5616-5625. [PMID: 27797836 DOI: 10.1093/cercor/bhw331] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2015] [Indexed: 11/14/2022] Open
Abstract
Individual differences in neuroanatomy are associated with intellectual ability and psychiatric risk. Factors responsible for this variability remain poorly understood. We tested whether 17 major demographic and obstetric variables were associated with individual differences in brain volumes in 756 neonates assessed with MRI. Gestational age at MRI, sex, gestational age at birth, and birthweight were the most significant predictors, explaining 31% to 59% of variance. Unexpectedly, earlier born babies had larger brains than later born babies after adjusting for other predictors. Our results suggest earlier born children experience accelerated brain growth, either as a consequence of the richer sensory environment they experience outside the womb or in response to other factors associated with delivery. In the full sample, maternal and paternal education, maternal ethnicity, maternal smoking, and maternal psychiatric history showed marginal associations with brain volumes, whereas maternal age, paternal age, paternal ethnicity, paternal psychiatric history, and income did not. Effects of parental education and maternal ethnicity are partially mediated by differences in birthweight. Remaining effects may reflect differences in genetic variation or cultural capital. In particular late initiation of prenatal care could negatively impact brain development. Findings could inform public health policy aimed at optimizing child development.
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Affiliation(s)
- Rebecca C Knickmeyer
- Department of Psychiatry, University of North Carolina, Chapel Hill, NC 27599-7160, USA
| | - Kai Xia
- Department of Psychiatry, University of North Carolina, Chapel Hill, NC 27599-7160, USA
| | - Zhaohua Lu
- Department of Human Development and Family Studies, Quantitative Developmental Systems Methodology, Pennsylvania State University, University Park, PA 16802, USA
| | - Mihye Ahn
- Department of Mathematics and Statistics, University of Nevada, Reno, NV 89557-0084, USA
| | - Shaili C Jha
- Curriculum in Neurobiology,University of North Carolina, Chapel Hill, NC 27599-7320, USA
| | - Fei Zou
- Department of Biostatistics,University of North Carolina, Chapel Hill, NC 27599-7420, USA
| | - Hongtu Zhu
- Department of Biostatistics,University of North Carolina, Chapel Hill, NC 27599-7420, USA
| | - Martin Styner
- Department of Psychiatry, University of North Carolina, Chapel Hill, NC 27599-7160, USA
| | - John H Gilmore
- Department of Psychiatry, University of North Carolina, Chapel Hill, NC 27599-7160, USA
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13
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Dallaire-Théroux C, Callahan BL, Potvin O, Saikali S, Duchesne S. Radiological-Pathological Correlation in Alzheimer's Disease: Systematic Review of Antemortem Magnetic Resonance Imaging Findings. J Alzheimers Dis 2018; 57:575-601. [PMID: 28282807 DOI: 10.3233/jad-161028] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
BACKGROUND The standard method of ascertaining Alzheimer's disease (AD) remains postmortem assessment of amyloid plaques and neurofibrillary degeneration. Vascular pathology, Lewy bodies, TDP-43, and hippocampal sclerosis are frequent comorbidities. There is therefore a need for biomarkers that can assess these etiologies and provide a diagnosis in vivo. OBJECTIVE We conducted a systematic review of published radiological-pathological correlation studies to determine the relationship between antemortem magnetic resonance imaging (MRI) and neuropathological findings in AD. METHODS We explored PubMed in June-July 2015 using "Alzheimer's disease" and combinations of radiological and pathological terms. After exclusion following screening and full-text assessment of the 552 extracted manuscripts, three others were added from their reference list. In the end, we report results based on 27 articles. RESULTS Independently of normal age-related brain atrophy, AD pathology is associated with whole-brain and hippocampal atrophy and ventricular expansion as observed on T1-weighted images. Moreover, cerebral amyloid angiopathy and cortical microinfarcts are also related to brain volume loss in AD. Hippocampal sclerosis and TDP-43 are associated with hippocampal and medial temporal lobe atrophy, respectively. Brain volume loss correlates more strongly with tangles than with any other pathological finding. White matter hyperintensities observed on proton density, T2-weighted and FLAIR images are strongly related to vascular pathologies, but are also associated with other histological changes such as gliosis or demyelination. CONCLUSION Cerebral atrophy and white matter changes in the living brain reflect underlying neuropathology and may be detectable using antemortem MRI. In vivo MRI may therefore be an avenue for AD pathological staging.
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Affiliation(s)
- Caroline Dallaire-Théroux
- CERVO Brain Research Center, Institut Universitaire en Santé Mentale de Québec, Quebec City, Quebec, Canada.,Faculty of Medicine, Université Laval, Quebec City, Quebec, Canada
| | - Brandy L Callahan
- CERVO Brain Research Center, Institut Universitaire en Santé Mentale de Québec, Quebec City, Quebec, Canada.,Faculty of Medicine, Université Laval, Quebec City, Quebec, Canada.,Sunnybrook Health Sciences Centre, Toronto, Ontario, Canada
| | - Olivier Potvin
- CERVO Brain Research Center, Institut Universitaire en Santé Mentale de Québec, Quebec City, Quebec, Canada.,Faculty of Medicine, Université Laval, Quebec City, Quebec, Canada
| | - Stéphan Saikali
- Faculty of Medicine, Université Laval, Quebec City, Quebec, Canada.,Department of Pathology, Centre Hospitalier Universitaire de Quebec, Quebec, Canada
| | - Simon Duchesne
- CERVO Brain Research Center, Institut Universitaire en Santé Mentale de Québec, Quebec City, Quebec, Canada.,Faculty of Medicine, Université Laval, Quebec City, Quebec, Canada
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14
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Abstract
OBJECTIVE The aim of this study was to investigate the use of one magnetic resonance image-processing tool, FSL, in its ability to perform automated segmentation of computed tomographic images of the brain. METHODS Head computed tomography (CT) images were brain extracted and segmented using the FSL tools BET and FAST, respectively. The products of segmentation were analyzed by histogram. The impact of image intensity inhomogeneity correction was investigated using simulated bias fields, 14 routine head CT scans, and selected illustrative clinical cases. RESULTS FSL FAST performs direct segmentation of head CT images, permitting quantitation of gray and white matter densities and volumes, achieving a more complete segmentation than masking methods. "Bias field correction" reduced the covariance of image signal intensities of the total brain and gray matter images (P < 0.01). Correction is larger when the effects of beam hardening and radiation scatter are larger, resulting in improved segmentation. CONCLUSIONS FSL FAST enables direct segmentation of head CT images.
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15
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Arakawa R, Stenkrona P, Takano A, Nag S, Maior RS, Halldin C. Test-retest reproducibility of [ 11C]-L-deprenyl-D 2 binding to MAO-B in the human brain. EJNMMI Res 2017. [PMID: 28634836 PMCID: PMC5478550 DOI: 10.1186/s13550-017-0301-4] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Background [11C]-l-deprenyl-D2 is a positron emission tomography (PET) radioligand for measurement of the monoamine oxidase B (MAO-B) activity in vivo brain. The estimation of the test-retest reproducibility is important for accurate interpretation of PET studies. Results We performed two [11C]-l-deprenyl-D2 scans for six healthy subjects and evaluated the test-retest variability of this radioligand. MAO-B binding was quantified by two tissue compartment model (2TCM) with three rate constants (K1, k2, k3) using metabolite-corrected plasma radioactivity. The λk3 defined as (K1/k2) × k3 was also calculated. The correlation between MAO-B binding and age, and the effect of partial volume effect correction (PVEc) for the reproducibility were also estimated. %difference of k3 was 2.6% (medial frontal cortex) to 10.3% (hippocampus), and that of λk3 was 5.0% (thalamus) to 9.2% (cerebellum). Mean %difference of all regions were 5.3 and 7.0% in k3 and λk3, respectively. All regions showed below 10% variabilities except the hippocampus in k3 (10.3%). Intraclass correlation coefficient (ICC) of k3 was 0.78 (hippocampus) to 0.98 (medial frontal cortex), and that of λk3 was 0.78 (hippocampus) to 0.95 (thalamus). Mean ICC were 0.94 and 0.89 in k3 and λk3, respectively. The highest positive correlation with age was observed in the hippocampus, as r = 0.75 in k3 and 0.76 in λk3. After PVEc, mean %difference were 5.6 and 7.2% in k3 and λk3, respectively. Mean ICC were 0.92 and 0.90 for k3 and λk3, respectively. These values were almost the same as those before PVEc. Conclusions The present results indicate that k3 and λk3 of [11C]-l-deprenyl-D2 are reliable parameters for test-retest reproducibility with healthy subjects both before and after PVEc. The studies with patients of larger sample size are required for further clinical applications.
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Affiliation(s)
- Ryosuke Arakawa
- Department of Clinical Neuroscience, Center for Psychiatry Research, Karolinska Institutet and Stockholm County Council, Stockholm, Sweden.
| | - Per Stenkrona
- Department of Clinical Neuroscience, Center for Psychiatry Research, Karolinska Institutet and Stockholm County Council, Stockholm, Sweden
| | - Akihiro Takano
- Department of Clinical Neuroscience, Center for Psychiatry Research, Karolinska Institutet and Stockholm County Council, Stockholm, Sweden
| | - Sangram Nag
- Department of Clinical Neuroscience, Center for Psychiatry Research, Karolinska Institutet and Stockholm County Council, Stockholm, Sweden
| | - Rafael S Maior
- Department of Clinical Neuroscience, Center for Psychiatry Research, Karolinska Institutet and Stockholm County Council, Stockholm, Sweden.,Primate Center and Laboratory of Neurosciences and Behavior, Department of Physiological Sciences, Institute of Biology, University of Brasilia, Brasilia, Brazil
| | - Christer Halldin
- Department of Clinical Neuroscience, Center for Psychiatry Research, Karolinska Institutet and Stockholm County Council, Stockholm, Sweden
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16
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Mak E, Gabel S, Mirette H, Su L, Williams GB, Waldman A, Wells K, Ritchie K, Ritchie C, O’Brien J. Structural neuroimaging in preclinical dementia: From microstructural deficits and grey matter atrophy to macroscale connectomic changes. Ageing Res Rev 2017; 35:250-264. [PMID: 27777039 DOI: 10.1016/j.arr.2016.10.001] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2016] [Revised: 08/26/2016] [Accepted: 10/19/2016] [Indexed: 12/18/2022]
Abstract
The last decade has witnessed a proliferation of neuroimaging studies characterising brain changes associated with Alzheimer's disease (AD), where both widespread atrophy and 'signature' brain regions have been implicated. In parallel, a prolonged latency period has been established in AD, with abnormal cerebral changes beginning many years before symptom onset. This raises the possibility of early therapeutic intervention, even before symptoms, when treatments could have the greatest effect on disease-course modification. Two important prerequisites of this endeavour are (1) accurate characterisation or risk stratification and (2) monitoring of progression using neuroimaging outcomes as a surrogate biomarker in those without symptoms but who will develop AD, here referred to as preclinical AD. Structural neuroimaging modalities have been used to identify brain changes related to risk factors for AD, such as familial genetic mutations, risk genes (for example apolipoprotein epsilon-4 allele), and/or family history. In this review, we summarise structural imaging findings in preclinical AD. Overall, the literature suggests early vulnerability in characteristic regions, such as the medial temporal lobe structures and the precuneus, as well as white matter tracts in the fornix, cingulum and corpus callosum. We conclude that while structural markers are promising, more research and validation studies are needed before future secondary prevention trials can adopt structural imaging biomarkers as either stratification or surrogate biomarkers.
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17
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Stelmokas J, Yassay L, Giordani B, Dodge HH, Dinov ID, Bhaumik A, Sathian K, Hampstead BM. Translational MRI Volumetry with NeuroQuant: Effects of Version and Normative Data on Relationships with Memory Performance in Healthy Older Adults and Patients with Mild Cognitive Impairment. J Alzheimers Dis 2017; 60:1499-1510. [PMID: 29060939 PMCID: PMC5858697 DOI: 10.3233/jad-170306] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
NeuroQuant (NQ) is a fully-automated program that overcomes several existing limitations in the clinical translation of MRI-derived volumetry. The current study characterized differences between the original (NQ1) and an updated NQ version (NQ2) by 1) replicating previously identified relationships between neuropsychological test performance and medial temporal lobe volumes, 2) evaluating the level of agreement between NQ versions, and 3) determining if the addition of NQ2 age-/sex-based z-scores hold greater clinical utility for prediction of memory impairment than standard percent of intracranial volume (% ICV) values. Sixty-seven healthy older adults and 65 mild cognitive impairment patients underwent structural MRI and completed cognitive testing, including the Immediate and Delayed Memory indices from the Repeatable Battery for the Assessment of Neuropsychological Status. Results generally replicated previous relationships between key medial temporal lobe regions and memory test performance, though comparison of NQ regions revealed statistically different values that were biased toward one version or the other depending on the region. NQ2 hippocampal z-scores explained additional variance in memory performance relative to % ICV values. Findings indicate that NQ1/2 medial temporal lobe volumes, especially age- and sex-based z-scores, hold clinical value, though caution is warranted when directly comparing volumes across NQ versions.
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Affiliation(s)
- Julija Stelmokas
- Veterans Affairs Ann Arbor Healthcare System, Mental Health Service (116B), 2215 Fuller Road, Ann Arbor, MI 48105, United States of America
| | - Lance Yassay
- Veterans Affairs Ann Arbor Healthcare System, Mental Health Service (116B), 2215 Fuller Road, Ann Arbor, MI 48105, United States of America
- Department of Psychiatry, University of Michigan, Ann Arbor, MI, USA
| | - Bruno Giordani
- Department of Psychiatry, University of Michigan, Ann Arbor, MI, USA
- Departments of Neurology, and Psychology and School of Nursing, University of Michigan, Ann Arbor, MI, USA
- Michigan Alzheimer’s Disease Core Center, University of Michigan, Ann Arbor, Michigan, United States of America
| | - Hiroko H. Dodge
- Michigan Alzheimer’s Disease Core Center, University of Michigan, Ann Arbor, Michigan, United States of America
- Department of Neurology and Layton Aging and Alzheimer’s Disease Center, Oregon Health &Science University, USA
| | - Ivo D. Dinov
- Statistics Online Computational Resource, School of Nursing, Michigan Institute for Data Science, University of Michigan, Ann Arbor, Michigan, United States of America
- Stevens Neuroimaging and Informatics Institute, University of Southern California, Los Angeles, California, United States of America
- Udall Center of Excellence for Parkinson’s Disease Research, University of Michigan, Ann Arbor, Michigan, United States of America
| | - Arijit Bhaumik
- Michigan Alzheimer’s Disease Core Center, University of Michigan, Ann Arbor, Michigan, United States of America
| | - K. Sathian
- Departments of Neurology, Rehabilitation Medicine, and Psychology, Emory University, Atlanta, GA, USA
- Rehabilitation R&D Center for Visual and Neurocognitive Rehabilitation, Atlanta VAMC, Decatur, GA, USA
| | - Benjamin M. Hampstead
- Veterans Affairs Ann Arbor Healthcare System, Mental Health Service (116B), 2215 Fuller Road, Ann Arbor, MI 48105, United States of America
- Department of Psychiatry, University of Michigan, Ann Arbor, MI, USA
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18
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Su F, Yuan P, Wang Y, Zhang C. The superior fault tolerance of artificial neural network training with a fault/noise injection-based genetic algorithm. Protein Cell 2016; 7:735-748. [PMID: 27502185 PMCID: PMC5055486 DOI: 10.1007/s13238-016-0302-5] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2016] [Accepted: 07/12/2016] [Indexed: 02/05/2023] Open
Abstract
Artificial neural networks (ANNs) are powerful computational tools that are designed to replicate the human brain and adopted to solve a variety of problems in many different fields. Fault tolerance (FT), an important property of ANNs, ensures their reliability when significant portions of a network are lost. In this paper, a fault/noise injection-based (FIB) genetic algorithm (GA) is proposed to construct fault-tolerant ANNs. The FT performance of an FIB-GA was compared with that of a common genetic algorithm, the back-propagation algorithm, and the modification of weights algorithm. The FIB-GA showed a slower fitting speed when solving the exclusive OR (XOR) problem and the overlapping classification problem, but it significantly reduced the errors in cases of single or multiple faults in ANN weights or nodes. Further analysis revealed that the fit weights showed no correlation with the fitting errors in the ANNs constructed with the FIB-GA, suggesting a relatively even distribution of the various fitting parameters. In contrast, the output weights in the training of ANNs implemented with the use the other three algorithms demonstrated a positive correlation with the errors. Our findings therefore indicate that a combination of the fault/noise injection-based method and a GA is capable of introducing FT to ANNs and imply that the distributed ANNs demonstrate superior FT performance.
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Affiliation(s)
- Feng Su
- Robotics Institute, Beihang University, Beijing, 100191, China.,State Key Laboratory of Membrane Biology, School of Life Sciences, Beijing, 100871, China.,PKU-IDG/McGovern Institute for Brain Research, Peking University, Beijing, 100871, China
| | - Peijiang Yuan
- Robotics Institute, Beihang University, Beijing, 100191, China
| | - Yangzhen Wang
- State Key Laboratory of Membrane Biology, School of Life Sciences, Beijing, 100871, China.,PKU-IDG/McGovern Institute for Brain Research, Peking University, Beijing, 100871, China
| | - Chen Zhang
- State Key Laboratory of Membrane Biology, School of Life Sciences, Beijing, 100871, China. .,PKU-IDG/McGovern Institute for Brain Research, Peking University, Beijing, 100871, China.
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19
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Winblad B, Amouyel P, Andrieu S, Ballard C, Brayne C, Brodaty H, Cedazo-Minguez A, Dubois B, Edvardsson D, Feldman H, Fratiglioni L, Frisoni GB, Gauthier S, Georges J, Graff C, Iqbal K, Jessen F, Johansson G, Jönsson L, Kivipelto M, Knapp M, Mangialasche F, Melis R, Nordberg A, Rikkert MO, Qiu C, Sakmar TP, Scheltens P, Schneider LS, Sperling R, Tjernberg LO, Waldemar G, Wimo A, Zetterberg H. Defeating Alzheimer's disease and other dementias: a priority for European science and society. Lancet Neurol 2016; 15:455-532. [DOI: 10.1016/s1474-4422(16)00062-4] [Citation(s) in RCA: 1001] [Impact Index Per Article: 125.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2015] [Revised: 10/06/2015] [Accepted: 02/09/2016] [Indexed: 12/15/2022]
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20
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Segmentation of human brain using structural MRI. MAGNETIC RESONANCE MATERIALS IN PHYSICS BIOLOGY AND MEDICINE 2016; 29:111-24. [DOI: 10.1007/s10334-015-0518-z] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2015] [Revised: 11/27/2015] [Accepted: 12/01/2015] [Indexed: 12/26/2022]
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21
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Coupé P, Fonov VS, Bernard C, Zandifar A, Eskildsen SF, Helmer C, Manjón JV, Amieva H, Dartigues J, Allard M, Catheline G, Collins DL. Detection of Alzheimer's disease signature in MR images seven years before conversion to dementia: Toward an early individual prognosis. Hum Brain Mapp 2015; 36:4758-70. [PMID: 26454259 PMCID: PMC6869408 DOI: 10.1002/hbm.22926] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2015] [Revised: 07/03/2015] [Accepted: 07/23/2015] [Indexed: 01/18/2023] Open
Abstract
Finding very early biomarkers of Alzheimer's Disease (AD) to aid in individual prognosis is of major interest to accelerate the development of new therapies. Among the potential biomarkers, neurodegeneration measurements from MRI are considered as good candidates but have so far not been effective at the early stages of the pathology. Our objective is to investigate the efficiency of a new MR-based hippocampal grading score to detect incident dementia in cognitively intact patients. This new score is based on a pattern recognition strategy, providing a grading measure that reflects the similarity of the anatomical patterns of the subject under study with dataset composed of healthy subjects and patients with AD. Hippocampal grading was evaluated on subjects from the Three-City cohort, with a followup period of 12 years. Experiments demonstrate that hippocampal grading yields prediction accuracy up to 72.5% (P < 0.0001) 7 years before conversion to AD, better than both hippocampal volume (58.1%, P = 0.04) and MMSE score (56.9%, P = 0.08). The area under the ROC curve (AUC) supports the efficiency of imaging biomarkers with a gain of 8.4 percentage points for hippocampal grade (73.0%) over hippocampal volume (64.6%). Adaptation of the proposed framework to clinical score estimation is also presented. Compared with previous studies investigating new biomarkers for AD prediction over much shorter periods, the very long followup of the Three-City cohort demonstrates the important clinical potential of the proposed imaging biomarker. The high accuracy obtained with this new imaging biomarker paves the way for computer-based prognostic aides to help the clinician identify cognitively intact subjects that are at high risk to develop AD.
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Affiliation(s)
- Pierrick Coupé
- Laboratoire Bordelais De Recherche En Informatique, Unité Mixte De Recherche CNRS (UMR 5800), PICTURA Research GroupBordeauxFrance
| | - Vladimir S. Fonov
- McConnell Brain Imaging Centre, Montreal Neurological Institute, McGill UniversityMontrealCanada
| | - Charlotte Bernard
- University of Bordeaux, INCIA, UMR 5287TalenceFrance
- CNRS, INCIA, UMR 5287TalenceFrance
- École Pratique des Hautes ÉtudesBordeauxFrance
| | - Azar Zandifar
- McConnell Brain Imaging Centre, Montreal Neurological Institute, McGill UniversityMontrealCanada
| | - Simon F. Eskildsen
- Center of Functionally Integrative Neuroscience and MINDLab, Aarhus UniversityAarhusDenmark
| | - Catherine Helmer
- INSERM, ISPED, Centre INSERM U897‐Epidemiologie‐BiostatistiqueBordeauxFrance
- Département de Pharmacologie CHU de BordeauxUniversity of BordeauxBordeauxFrance
- INSERM, CIC 14.01, Module ECBordeauxFrance
| | - José V. Manjón
- Instituto De Aplicaciones De Las Tecnologías De La Información Y De Las Comunicaciones Avanzadas (ITACA), Universitat Politècnica De ValènciaCamino De Vera S/NValencia46022Spain
| | - Hélène Amieva
- INSERM, ISPED, Centre INSERM U897‐Epidemiologie‐BiostatistiqueBordeauxFrance
- Département de Pharmacologie CHU de BordeauxUniversity of BordeauxBordeauxFrance
- INSERM, CIC 14.01, Module ECBordeauxFrance
| | - Jean‐François Dartigues
- INSERM, ISPED, Centre INSERM U897‐Epidemiologie‐BiostatistiqueBordeauxFrance
- Département de Pharmacologie CHU de BordeauxUniversity of BordeauxBordeauxFrance
- University Hospital, Memory Consultation, CMRRBordeauxFrance
| | - Michèle Allard
- University of Bordeaux, INCIA, UMR 5287TalenceFrance
- CNRS, INCIA, UMR 5287TalenceFrance
- École Pratique des Hautes ÉtudesBordeauxFrance
| | - Gwenaelle Catheline
- University of Bordeaux, INCIA, UMR 5287TalenceFrance
- CNRS, INCIA, UMR 5287TalenceFrance
- École Pratique des Hautes ÉtudesBordeauxFrance
| | - D. Louis Collins
- McConnell Brain Imaging Centre, Montreal Neurological Institute, McGill UniversityMontrealCanada
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22
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Wang G, Zhang X, Su Q, Shi J, Caselli RJ, Wang Y. A novel cortical thickness estimation method based on volumetric Laplace-Beltrami operator and heat kernel. Med Image Anal 2015; 22:1-20. [PMID: 25700360 PMCID: PMC4405465 DOI: 10.1016/j.media.2015.01.005] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2013] [Revised: 01/22/2015] [Accepted: 01/23/2015] [Indexed: 12/31/2022]
Abstract
Cortical thickness estimation in magnetic resonance imaging (MRI) is an important technique for research on brain development and neurodegenerative diseases. This paper presents a heat kernel based cortical thickness estimation algorithm, which is driven by the graph spectrum and the heat kernel theory, to capture the gray matter geometry information from the in vivo brain magnetic resonance (MR) images. First, we construct a tetrahedral mesh that matches the MR images and reflects the inherent geometric characteristics. Second, the harmonic field is computed by the volumetric Laplace-Beltrami operator and the direction of the steamline is obtained by tracing the maximum heat transfer probability based on the heat kernel diffusion. Thereby we can calculate the cortical thickness information between the point on the pial and white matter surfaces. The new method relies on intrinsic brain geometry structure and the computation is robust and accurate. To validate our algorithm, we apply it to study the thickness differences associated with Alzheimer's disease (AD) and mild cognitive impairment (MCI) on the Alzheimer's Disease Neuroimaging Initiative (ADNI) dataset. Our preliminary experimental results on 151 subjects (51 AD, 45 MCI, 55 controls) show that the new algorithm may successfully detect statistically significant difference among patients of AD, MCI and healthy control subjects. Our computational framework is efficient and very general. It has the potential to be used for thickness estimation on any biological structures with clearly defined inner and outer surfaces.
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Affiliation(s)
- Gang Wang
- School of Information and Electrical Engineering, Ludong University, Yantai, China; School of Computing, Informatics, and Decision Systems Engineering, Arizona State University, Tempe, AZ, USA
| | - Xiaofeng Zhang
- School of Information and Electrical Engineering, Ludong University, Yantai, China
| | - Qingtang Su
- School of Information and Electrical Engineering, Ludong University, Yantai, China
| | - Jie Shi
- School of Computing, Informatics, and Decision Systems Engineering, Arizona State University, Tempe, AZ, USA
| | - Richard J Caselli
- Department of Neurology, Mayo Clinic Arizona, Scottsdale, AZ, USA; Arizona Alzheimer's Consortium, Phoenix, AZ, USA
| | - Yalin Wang
- School of Computing, Informatics, and Decision Systems Engineering, Arizona State University, Tempe, AZ, USA; Arizona Alzheimer's Consortium, Phoenix, AZ, USA.
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23
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Abstract
A recent study has found that obese women (but not men) have difficulty inhibiting food-rewarded, but not money-rewarded, appetitive behaviour, suggesting that obesity is associated with cognitive deficits that could selectively promote food intake, perhaps in a sex-dependent manner.
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24
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Nir TM, Villalon-Reina JE, Prasad G, Jahanshad N, Joshi SH, Toga AW, Bernstein MA, Jack CR, Weiner MW, Thompson PM. Diffusion weighted imaging-based maximum density path analysis and classification of Alzheimer's disease. Neurobiol Aging 2015; 36 Suppl 1:S132-40. [PMID: 25444597 PMCID: PMC4283487 DOI: 10.1016/j.neurobiolaging.2014.05.037] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2013] [Revised: 05/13/2014] [Accepted: 05/13/2014] [Indexed: 10/24/2022]
Abstract
Characterizing brain changes in Alzheimer's disease (AD) is important for patient prognosis and for assessing brain deterioration in clinical trials. In this diffusion weighted imaging study, we used a new fiber-tract modeling method to investigate white matter integrity in 50 elderly controls (CTL), 113 people with mild cognitive impairment, and 37 AD patients. After clustering tractography using a region-of-interest atlas, we used a shortest path graph search through each bundle's fiber density map to derive maximum density paths (MDPs), which we registered across subjects. We calculated the fractional anisotropy (FA) and mean diffusivity (MD) along all MDPs and found significant MD and FA differences between AD patients and CTL subjects, as well as MD differences between CTL and late mild cognitive impairment subjects. MD and FA were also associated with widely used clinical scores. As an MDP is a compact low-dimensional representation of white matter organization, we tested the utility of diffusion tensor imaging measures along these MDPs as features for support vector machine based classification of AD.
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Affiliation(s)
- Talia M Nir
- Imaging Genetics Center, Institute for Neuroimaging & Informatics, University of Southern California, Los Angeles, CA, USA
| | - Julio E Villalon-Reina
- Imaging Genetics Center, Institute for Neuroimaging & Informatics, University of Southern California, Los Angeles, CA, USA
| | - Gautam Prasad
- Imaging Genetics Center, Institute for Neuroimaging & Informatics, University of Southern California, Los Angeles, CA, USA
| | - Neda Jahanshad
- Imaging Genetics Center, Institute for Neuroimaging & Informatics, University of Southern California, Los Angeles, CA, USA
| | - Shantanu H Joshi
- Department of Neurology, UCLA School of Medicine, Los Angeles, CA, USA
| | - Arthur W Toga
- Imaging Genetics Center, Institute for Neuroimaging & Informatics, University of Southern California, Los Angeles, CA, USA
| | - Matt A Bernstein
- Department of Radiology, Mayo Clinic and Foundation, Rochester, MN, USA
| | - Clifford R Jack
- Department of Radiology, Mayo Clinic and Foundation, Rochester, MN, USA
| | - Michael W Weiner
- Department of Radiology and Biomedical Imaging, UCSF School of Medicine, San Francisco, CA, USA
| | - Paul M Thompson
- Imaging Genetics Center, Institute for Neuroimaging & Informatics, University of Southern California, Los Angeles, CA, USA; Department of Neurology, University of Southern California, Los Angeles, CA, USA; Department of Psychiatry, University of Southern California, Los Angeles, CA, USA; Department of Radiology, University of Southern California, Los Angeles, CA, USA; Department of Engineering, University of Southern California, Los Angeles, CA, USA; Department of Pediatrics, University of Southern California, Los Angeles, CA, USA; Department of Ophthalmology, University of Southern California, Los Angeles, CA, USA.
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25
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Shi J, Stonnington CM, Thompson PM, Chen K, Gutman B, Reschke C, Baxter LC, Reiman EM, Caselli RJ, Wang Y. Studying ventricular abnormalities in mild cognitive impairment with hyperbolic Ricci flow and tensor-based morphometry. Neuroimage 2014; 104:1-20. [PMID: 25285374 DOI: 10.1016/j.neuroimage.2014.09.062] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2014] [Revised: 09/20/2014] [Accepted: 09/29/2014] [Indexed: 11/29/2022] Open
Abstract
Mild Cognitive Impairment (MCI) is a transitional stage between normal aging and dementia and people with MCI are at high risk of progression to dementia. MCI is attracting increasing attention, as it offers an opportunity to target the disease process during an early symptomatic stage. Structural magnetic resonance imaging (MRI) measures have been the mainstay of Alzheimer's disease (AD) imaging research, however, ventricular morphometry analysis remains challenging because of its complicated topological structure. Here we describe a novel ventricular morphometry system based on the hyperbolic Ricci flow method and tensor-based morphometry (TBM) statistics. Unlike prior ventricular surface parameterization methods, hyperbolic conformal parameterization is angle-preserving and does not have any singularities. Our system generates a one-to-one diffeomorphic mapping between ventricular surfaces with consistent boundary matching conditions. The TBM statistics encode a great deal of surface deformation information that could be inaccessible or overlooked by other methods. We applied our system to the baseline MRI scans of a set of MCI subjects from the Alzheimer's Disease Neuroimaging Initiative (ADNI: 71 MCI converters vs. 62 MCI stable). Although the combined ventricular area and volume features did not differ between the two groups, our fine-grained surface analysis revealed significant differences in the ventricular regions close to the temporal lobe and posterior cingulate, structures that are affected early in AD. Significant correlations were also detected between ventricular morphometry, neuropsychological measures, and a previously described imaging index based on fluorodeoxyglucose positron emission tomography (FDG-PET) scans. This novel ventricular morphometry method may offer a new and more sensitive approach to study preclinical and early symptomatic stage AD.
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Affiliation(s)
- Jie Shi
- School of Computing, Informatics, and Decision Systems Engineering, Arizona State University, Tempe, AZ, USA
| | | | - Paul M Thompson
- Imaging Genetics Center, Institute for Neuroimaging and Informatics, University of Southern California, Los Angeles, CA, USA
| | - Kewei Chen
- Banner Alzheimer's Institute and Banner Good Samaritan PET Center, Phoenix, AZ, USA
| | - Boris Gutman
- Imaging Genetics Center, Institute for Neuroimaging and Informatics, University of Southern California, Los Angeles, CA, USA
| | - Cole Reschke
- Banner Alzheimer's Institute and Banner Good Samaritan PET Center, Phoenix, AZ, USA
| | - Leslie C Baxter
- Human Brain Imaging Laboratory, Barrow Neurological Institute, Phoenix, AZ, USA
| | - Eric M Reiman
- Banner Alzheimer's Institute and Banner Good Samaritan PET Center, Phoenix, AZ, USA
| | | | - Yalin Wang
- School of Computing, Informatics, and Decision Systems Engineering, Arizona State University, Tempe, AZ, USA.
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26
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Martinez-Torteya A, Rodriguez-Rojas J, Celaya-Padilla JM, Galván-Tejada JI, Treviño V, Tamez-Peña J. Magnetization-prepared rapid acquisition with gradient echo magnetic resonance imaging signal and texture features for the prediction of mild cognitive impairment to Alzheimer's disease progression. J Med Imaging (Bellingham) 2014; 1:031005. [PMID: 26158047 DOI: 10.1117/1.jmi.1.3.031005] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2014] [Revised: 07/27/2014] [Accepted: 08/22/2014] [Indexed: 01/31/2023] Open
Abstract
Early diagnoses of Alzheimer's disease (AD) would confer many benefits. Several biomarkers have been proposed to achieve such a task, where features extracted from magnetic resonance imaging (MRI) have played an important role. However, studies have focused exclusively on morphological characteristics. This study aims to determine whether features relating to the signal and texture of the image could predict mild cognitive impairment (MCI) to AD progression. Clinical, biological, and positron emission tomography information and MRI images of 62 subjects from the AD neuroimaging initiative were used in this study, extracting 4150 features from each MRI. Within this multimodal database, a feature selection algorithm was used to obtain an accurate and small logistic regression model, generated by a methodology that yielded a mean blind test accuracy of 0.79. This model included six features, five of them obtained from the MRI images, and one obtained from genotyping. A risk analysis divided the subjects into low-risk and high-risk groups according to a prognostic index. The groups were statistically different ([Formula: see text]). These results demonstrated that MRI features related to both signal and texture add MCI to AD predictive power, and supported the ongoing notion that multimodal biomarkers outperform single-modality ones.
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Affiliation(s)
- Antonio Martinez-Torteya
- Tecnológico de Monterrey , Cátedra de Bioinformática, Escuela de Ingeniería, Departamento de Ciencias Computacionales, Monterrey 64849, Mexico
| | - Juan Rodriguez-Rojas
- Tecnológico de Monterrey , Cátedra de Bioinformática, Escuela de Ingeniería, Departamento de Ciencias Computacionales, Monterrey 64849, Mexico
| | - José M Celaya-Padilla
- Tecnológico de Monterrey , Cátedra de Bioinformática, Escuela de Ingeniería, Departamento de Ciencias Computacionales, Monterrey 64849, Mexico
| | - Jorge I Galván-Tejada
- Tecnológico de Monterrey , Cátedra de Bioinformática, Escuela de Ingeniería, Departamento de Ciencias Computacionales, Monterrey 64849, Mexico
| | - Victor Treviño
- Tecnológico de Monterrey , Cátedra de Bioinformática, Escuela de Ingeniería, Departamento de Ciencias Computacionales, Monterrey 64849, Mexico ; Tecnológico de Monterrey , Cátedra de Bioinformática, Escuela de Medicina, Departamento de Investigación e Innovación, Monterrey 64710, Mexico
| | - Jose Tamez-Peña
- Tecnológico de Monterrey , Cátedra de Bioinformática, Escuela de Ingeniería, Departamento de Ciencias Computacionales, Monterrey 64849, Mexico ; Tecnológico de Monterrey , Cátedra de Bioinformática, Escuela de Medicina, Departamento de Investigación e Innovación, Monterrey 64710, Mexico
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27
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Geschwind D, Nestler EJ. Neurodegenerative dementias: connecting psychiatry and neurology through a shared neurobiology. Biol Psychiatry 2014; 75:518-9. [PMID: 24629667 DOI: 10.1016/j.biopsych.2014.02.007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/13/2014] [Accepted: 02/13/2014] [Indexed: 11/30/2022]
Affiliation(s)
- Daniel Geschwind
- Department of Neurology, University of California Los Angeles School of Medicine, Los Angeles, California.
| | - Eric J Nestler
- Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, New York
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